Every single solopreneur, bootstrapper, or founder that I know that is even remotely successful, all have one common trait: they write a lot.
If you're building your own product, and the only thing you've written thus far is code, your product is not to make it.
Why?
Building a product often isn't the hard part. You're starting with the easy part. The hard parts are finding your initial few customers (your mom/friends don't count), doing market research, finding PMF, etc.
And that requires you to write in human language, not code.
PS: prompting AI to write your code also doesn't count, that's lowkey still coding